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Tectonic implications of fluvial incision and pediment deformation at the northern margin of the Central Anatolian Plateau based on multiple cosmogenic nuclides

  • We document Quaternary fluvial incision driven by fault-controlled surface deformation in the inverted intermontane Gökirmak Basin in the Central Pontide mountains along the northern margin of the Central Anatolian Plateau. In-situ-produced Be-10, Ne-21, and Cl-36 concentrations from gravel-covered fluvial terraces and pediment surfaces along the trunk stream of the basin (the Gökirmak River) yield model exposure ages ranging from 71ka to 34645ka and average fluvial incision rates over the past similar to 350ka of 0.280.01mm a(-1). Similarities between river incision rates and coastal uplift rates at the Black Sea coast suggest that regional uplift is responsible for the river incision. Model exposure ages of deformed pediment surfaces along tributaries of the trunk stream range from 605ka to 110 +/- 10ka, demonstrating that the thrust faults responsible for pediment deformation were active after those times and were likely active earlier as well as explaining the topographic relief of the region. Together, our data demonstrateWe document Quaternary fluvial incision driven by fault-controlled surface deformation in the inverted intermontane Gökirmak Basin in the Central Pontide mountains along the northern margin of the Central Anatolian Plateau. In-situ-produced Be-10, Ne-21, and Cl-36 concentrations from gravel-covered fluvial terraces and pediment surfaces along the trunk stream of the basin (the Gökirmak River) yield model exposure ages ranging from 71ka to 34645ka and average fluvial incision rates over the past similar to 350ka of 0.280.01mm a(-1). Similarities between river incision rates and coastal uplift rates at the Black Sea coast suggest that regional uplift is responsible for the river incision. Model exposure ages of deformed pediment surfaces along tributaries of the trunk stream range from 605ka to 110 +/- 10ka, demonstrating that the thrust faults responsible for pediment deformation were active after those times and were likely active earlier as well as explaining the topographic relief of the region. Together, our data demonstrate cumulative incision that is linked to active internal shortening and uplift of similar to 0.3mm a(-1) in the Central Pontide orogenic wedge, which may ultimately contribute to the lateral growth of the northern Anatolian Plateau.show moreshow less

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Metadaten
Author:Cengiz Yildirim, Taylor F. Schildgen, Helmut Peter EchtlerGND, Daniel MelnickORCiDGND, Bodo BookhagenORCiDGND, Attila Ciner, Samuel Niedermann, Silke Merchel, Martin Martschini, Peter Steier, Manfred R. StreckerORCiDGND
DOI:https://doi.org/10.1002/tect.20066
ISSN:0278-7407 (print)
ISSN:1944-9194 (online)
Parent Title (English):Tectonics
Publisher:American Geophysical Union
Place of publication:Washington
Document Type:Article
Language:English
Year of first Publication:2013
Year of Completion:2013
Release Date:2017/03/26
Tag:Fluvial Incision; Surface Exposure Age; Tectonic Geomorphology; Uplift Rate
Volume:32
Issue:5
Pagenumber:14
First Page:1107
Last Page:1120
Funder:TOPO-EUROPE initiative of the European Science Foundation; German Science Foundation (DFG) [STR373/20-1, STR373/25-1]; Potsdam University; Deutsches GeoForschungsZentrum Potsdam; DFG; Leibniz Center for Surface Processes and Climate Studies at the University of Potsdam [DFG: STR373/20-1]; Alexander von Humboldt Foundation; NASA [NNX08AG05G]; TUBITAK [107Y333]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften
Peer Review:Referiert